<!DOCTYPE html>
<html>
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <link rel="stylesheet" href="./css/bootstrap.css">
  <script src="./js/jquery.min.js"></script>
  <script src="./js/popper.min.js"></script>
  <script src="./js/bootstrap.min.js"></script>
  <title>Document</title>
  <style>
    .xz-index-r1{
      height: 375px;
    }
    .xz-index-r2{
      height: 233px;
    }
  </style>
</head>

<body>
  <div class="xz-index">
    <div class="container">
      <!-- 第一行 -->
      <div class="row">
        <!-- 第一行第一列 -->
        <div class="xz-index-r1 col-xl-7 col-lg-7 col-md-6 col-sm-12 col-12 mb-3">
          <div class="bg-primary w-100 h-100"></div>
        </div>
        <!-- 第一行第二列 -->
        <div class="xz-index-r1 col-xl-5 col-lg-5 col-md-6 col-sm-12 col-12 mb-3">
          <div class="bg-danger w-100 h-100"></div>
        </div>
      </div>
      <!-- 第二行 -->
      <div class="row">
        <!-- 第二行左侧列 -->
        <div class="xz-index-r2 col-xl-5 col-lg-5 d-lg-block d-md-none d-sm-none d-none">
          <div class="bg-warning w-100 h-100"></div>
        </div>
        <!-- 第二行的右侧列 -->
        <div class="col-xl-7 col-lg-7 col-md-12 col-sm-12 col-12">
          <div class="row">
            <div class="xz-index-r2 col-xl-4 col-lg-4 col-md-4 col-sm-12 col-12 mb-3">
              <div class="bg-success w-100 h-100"></div>
            </div>
            <div class="xz-index-r2 col-xl-4 col-lg-4 col-md-4 col-sm-12 col-12 mb-3">
              <div class="bg-success w-100 h-100"></div>
            </div>
            <div class="xz-index-r2 col-xl-4 col-lg-4 col-md-4 col-sm-12 col-12 mb-3">
              <div class="bg-success w-100 h-100"></div>
            </div>
          </div>
        </div>
      </div>
    </div>
</div>
</body>

</html>